{"paper":{"title":"Effect of pion thermal width on the sigma spectrum","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Munehisa Ohtani, Osamu Morimatsu, Tetsuo Nishikawa, Yoshimasa Hidaka","submitted_at":"2003-04-22T11:46:36Z","abstract_excerpt":"We study the effect of thermal width of $\\pi$ on the spectral function of $\\sigma$ applying a resummation technique called optimized perturbation theory at finite temperature ($T$) to ${\\cal O}(4)$ linear sigma model. In order to take into account finite thermal width of $\\pi$, we replace the internal pion mass in the self-energy of $\\sigma$ with that of complex pole found in a previous paper. The obtained spectral function for $T\\aplg 100 {\\rm MeV}$ turns out to possess two broad peaks. Although a sharp peak at $\\sigma\\to\\pi\\pi$ threshold was observed in the one-loop calculation without pion "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0304204","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}